Characteristic-mode-theory-based method for designing two-port MIMO antenna with reconfigurable directional pattern

Abstract

The invention relates to a characteristic-mode-theory-based method for designing a two-port MIMO antenna with a reconfigurable directional pattern. The method comprises: step one, a characteristic mode curve of a rectangular metal copper-clad plate is calculated according to a characteristic mode theory and thus the shape and dimension of the metal copper-clad plate have n resonance modes with feature values of 0 in a working band, wherein the n is larger than or equal to 3. Step two, characteristic currents of the resonance modes are extracted and a characteristic current vector distributionmap is generated, wherein a lowest current location in the characteristic current vector distribution map is a feed point location corresponding to each mode and the structure of a radiation floor andneeded two groups of resonance modes are obtained by the feed point locations; step three, two groups of corresponding capacitive coupling units are introduced at the feed point locations corresponding to the two groups of resonance modes; and step four, two reconfigurable feed networks are designed and power is fed between each group of capacitive coupling unit and the radiation floor in the step three so as to generate excitation voltages to excite the corresponding resonance modes.

Description

technical field [0001] The invention belongs to the technical field of communication antenna design, in particular to a design method of a 2-port MIMO antenna with reconfigurable pattern based on eigenmode theory, which can be used for mobile terminals in the 2.5G Wi-Fi communication frequency band. Background technique [0002] With the rapid development of mobile communication systems, users' demands for higher communication rates and higher communication quality are increasing day by day. MIMO technology emerges as the times require. It implements multi-path propagation of signals by using multi-antenna technology in the base station and terminal respectively, and then can double the communication rate and system capacity without increasing the working bandwidth. However, in practical applications, wireless devices usually work in a dynamic environment. The capacity of a MIMO antenna system with a fixed radiation pattern will be affected when the operating environment ha...

AI Technical Summary

Problems solved by technology

The problem with this design method is that multiple antenna elements take up a lot of physical space, which does not satisfy the practical application

Moreover, the introduction of isolation technology not only makes the antenna structure more complex, but also cannot achieve complete orthogonality between antenna elements.

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